UPDATE: LAPD arrests 2 suspects in fatal stabbing of teenager at Grover Cleveland High School in Reseda

UPDATE 7:11 a.m.: Los Angeles police have arrested two people for a deadly stabbing at a San Fernando Valley high school.

Police on Thursday arrested a 16-year-old boy and 19-year-old Michael Carpio of Panorama City on suspicion of murder. Carpio has no public phone listing and couldn't immediately be reached for comment.

Police say social media helped them track down the suspects in the Wednesday afternoon attack that killed a handball player at Grover Cleveland High School in Reseda.

Witnesses say he was at the high school handball court when two people approached and there was an argument. One punched Orellano, who was fighting him when the other pulled a pocket knife and stabbed him.

Orellano died at a hospital.

PREVIOUSLY: Los Angeles police say an 18-year-old who was stabbed on the campus of a San Fernando Valley high school has died.

Police spokesman Christopher Ngo says two suspects stabbed the young man soon after classes were over Wednesday at Grover Cleveland High School in Reseda.

Ngo says the student was taken to a hospital where he was declared dead. His name has not been released because relatives have yet to be notified.